They are popular in fanfiction because they both have such strong and distinct personalities. Alec is the stoic and responsible leader, while Clary is the brave and creative new addition to the Shadowhunter world. Their interactions can be full of tension, drama, and also the potential for great friendship or more, which is very appealing to write about.
Well, their relationship in the original series has a lot of potential for exploration in fanfiction. They start off as somewhat at odds with each other, but as they face common enemies and challenges, there is room for their relationship to grow and change in many different ways that fanfiction writers like to explore.
One popular Alec x Clary fanfiction might be those that explore their relationship in an alternate universe. For example, a story where they meet under different circumstances than in the original series. Maybe they're both on a secret mission together and start to develop feelings that way.
Their complex relationship in the original series. They start as comrades in a world full of magic and danger, and the idea of exploring a romantic side to their relationship is very appealing.
The 'alternate universe' trope is frequently used as well. In these fanfics, the writers might create a world where Clary and Alec have different backstories or the Shadowhunter world operates differently. For instance, an AU where they are both mundanes who discover the Shadowhunter world together, which completely changes the dynamic of their relationship from the start and gives a fresh take on their characters and how they interact.
One popular storyline could be how they deal with the challenges of being young and expecting in the dangerous world of Shadowhunters. They might have to face threats from demons while also preparing for the baby.
Friendship is a very common theme. They are both important characters in the Shadowhunter universe, and many fanfictions explore how they become friends and support each other.
They exist because it creates drama. The relationship between Clary and Alec in the original story has a lot of potential for conflict. Writers explore different scenarios where Clary might hurt Alec, either intentionally or not, to add more depth and angst to the story.
The allure of Alec and Bella as a pairing lies in the contrast they present. Alec, with his vampire powers and the mystery surrounding his character, and Bella, a mortal with her own charm and tenacity. Their relationship can be explored in so many ways, from a slow - burn romance to a passionate and immediate connection. Also, fans like to create alternative storylines to the original ones, and this pairing offers a great opportunity for that.
Well, it's very probable. 'Shadowhunters' has a large and creative fan base. Given the popularity of the characters Clary and Alec, fans might be interested in writing about a moment like a kiss between them. However, the quality and nature of these fanfictions can vary greatly. Some might focus more on the emotional build - up to the kiss, while others might just include it as a part of a larger story arc.
One common theme could be betrayal. Alec might be in a situation where he has to betray Clary for some reason, like loyalty to his own group or family, which causes her harm.